I suggest you go beyond elliptical stylus shape on aluminum cantilever cartridges.
At least get an advanced profile, shibata, or one of the many different named line contact variations.
next, what cantilever design and material? rod, tube, tapered, boron, or
take a risk on vintage to get no longer made beryllium, and the combined advantage of lighter tracking force of only 1.25g
I just won another auction for an AT160ML for $130. with all the fees and shipping it will be less than $200. AT155 and AT150 are out there as well.
When it is worn, I can have the beryllium carefully retipped by VAS, or buy one of 3 new VMN stylus with boron cantilever that fit that AT160 body.
here’s one in Finland, seller says headshell not included). It has both overhang and azimuth adjustment, I would try to buy it. The ones from Yahoo Japan often include the headshell,
https://www.finn.no/recommerce/forsale/item/435421429
They are advanced MM designs, I have a few MC cartridges, they are good, but I prefer the AT150ML and AT160ML MMs
.ps, I encourage you to think long, about getting a TT with a tonearm with adjustability and removable headshell, so you can have a true Mono cartridge, and a small collection of MM and MC cartridges, better yet two arms, Stereo and Mono on call instantly.
..................
top of your budget, $460. this is Ortofon's Line Contact, low profile for REGA's
https://www.audioadvisor.com/or2mrbronze?sku=NEW-OR2MRBRONZE